JPS63125478A - Steering device for combined harvester and thresher or the like - Google Patents

Abstract

PURPOSE:To facilitate corrections on the direction of progress in a sloping area by allowing a steering device to take a slow turn through operating only one side of the right and left travelling devices when the lateral inclination of a travelling car body is small, and then allowing it to take a steep turn through operating the right and left travelling devices in the directions opposite to each other when said lateral inclination is large. CONSTITUTION:A travelling device 2 is operated by means of a continuously variable transmission 3 which is comprised of a variable delivery type hydraulic pump 20 directly connected with a hydraulic motor 19. On a steering lever 21 is provided a potentiometer 22 for detecting the oscillating position of the lever 21, and then, the device is constituted in such a manner that, by an amount in which the steering lever 21 is turned, the swash plate angle of the hydraulic pump 20 is displaced in an amount equal to said amount. When the lateral inclination of a car body is detected by a sensor 16 and the detected value is inputted to a control unit 24, the swash plates of the right and left hydraulic pumps 20, 20 are controlled according to the state in which a lever 4 is operated so that a turning state corresponding to the sloping land can be taken by means of a potentiometer 23.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a steering device for a combine harvester, etc.
It can be used not only for combines but also for tractors, etc.

2. Description of the Related Art Conventionally, a technique is known in which a steering lever for correcting the traveling direction of a traveling vehicle body is selected and switched to a slow turning position or a sharp turning position depending on the traveling condition, thereby steering the traveling vehicle body.

Problems to be Solved by the Invention However, when the vehicle body tilts left and right on soft soil while driving and the direction of travel begins to deviate toward the sloped side, it is necessary to loosen the steering lever to correct the direction of travel. When the vehicle is operated to a turning position, only the traveling device on the slope side is driven and the traveling device on the opposite side is not driven, so it takes time to correct the direction, and the vehicle may meander significantly, or the vehicle may become increasingly tilted. If the vehicle becomes too large to return to its original direction of travel, or if you operate the steering lever to a sharp turn position to correct the direction of travel while driving on hard soil, the left and right traveling devices will be driven in opposite directions. Because of this, there were problems such as the traveling vehicle body turning greatly and the direction of travel being greatly lopsided, which was not only false but also dangerous.

Therefore, the present invention accurately determines the direction of travel by controlling the steering lever to rotate in a predetermined manner to switch the steering state to the optimum state of slow turning or sharp turning in response to the left and right inclination of the vehicle body. The purpose of this invention is to eliminate erroneous operation of the steering lever and improve driving performance.

Means for Solving the Problems The present invention provides devices 3, 3 that separately drive left and right traveling devices 2, 2 mounted below a traveling vehicle body 1, respectively, and that are continuously variable in both forward and reverse rotation. In addition to providing
When the left-right tilt of the traveling vehicle body 1 is reduced by a predetermined rotational operation of the steering lever 4 that corrects the traveling direction of the traveling vehicle body 1, the left-right tilt is changed to a gentle turn in which only one of the left and right traveling devices 2 is driven. When this becomes large, a steering device such as a combine harvester is configured so that the steering state can be switched and controlled to make a sharp turn by driving the left and right traveling devices 2 in opposite directions.

Effect of the Invention During driving, when the left-right inclination of the traveling vehicle body 1 is small, when the steering lever 4 for correcting the traveling direction is operated by a predetermined rotation, a gentle turn is performed to drive only the traveling device on the inclined side, and the traveling direction is changed. has been corrected, and when the steering lever 4 is rotated in a predetermined manner on soft soil with a large left-right slope, a sharp turn is made in which the traveling device on the opposite slope side is driven in the opposite direction to the traveling device on the slope side. The traveling direction of the traveling vehicle body 1 is corrected.

Effects of the Invention Accordingly, since the turning state is controlled to be switched between slow turning and sharp turning in response to the left and right inclination of the traveling vehicle body 1, the traveling vehicle body 1 is tilted left and right and the traveling direction begins to shift toward the inclined side. When the steering lever 4 is operated, the optimum turning state is achieved for correcting the direction of travel, making it possible to correct the direction of travel, making steering operations easier and more accurate, and improving driving performance. .

Embodiment The illustrated example shows a conventional combine harvester, in which 5 is a reaping section mounted on the front end of the traveling vehicle body 1, and 6 is a section for threshing and sorting the husk harvested by the reaping section 5. This is a threshing device arranged behind the reaping section 5 and mounted on the traveling vehicle body 1, and below this traveling vehicle body 1 there are traveling devices 2 on the left and right.
2 is installed.

The reaping section 5 includes a pre-processing section 11 that includes a grass cutting body 7, a reel 8, a cutting blade 9, an auger drum 10, etc., and a fray 1112.
The conveyor screw rotor 13 is mounted on the rear part.
is provided, the reel 8 is used to scrape the grass, the cutting body 7 is used to cut and reap the base of the culm, which has been divided by the cutting blade 9, and the cut culm is raked up by the auger drum 1o and transported. The grain is transported rearward and upward by a screw rotor 13 and supplied to the threshing device 6. The reaping section 5 is rotatably provided on the upper end of the frame 14 of the Fmm screw rotor 13 by a hydraulic cylinder 15 about two horizontal axes, and the pre-processing section 11 The conveying screw rotor 1 is attached to the front end of the frame 14.
A hydraulic cylinder 17 is actuated by a signal from a sensor 16 that detects the left and right inclination of the vehicle body 1, and the pretreatment unit 11 is placed horizontally with respect to the soil surface. The configuration is such that it rolls.

The threshing device 6 has a handling cylinder 18 along the front and back direction on the upper side.
A winnowing fan, a swinging sorting device, etc. are installed below the handling cylinder 18, and the husks transferred by the conveying screw rotor 13 are threshed and sorted.

The threshing device 6 has a handling cylinder 18 along the front and back direction on the upper side.
A winnowing fan, a swinging sorting device, etc. are installed below this handling pH 18, and the husks transferred by the conveying screw rotor 13 are threshed and sorted.

Said left and right traveling bags r! 12, 2 are driven by continuously variable transmissions 3, 3, which are comprised of variable displacement hydraulic pumps 20, 20 whose oil passages are directly connected to hydraulic motors 19, 19 that drive these. This hydraulic pump 20.20
By adjusting the angle of the swash plate, the discharge amount and discharge direction of the hydraulic fluid to be discharged are independently adjusted.
It is configured so that it can move forward, backward, or turn.

A steering lever 21 is provided on a control platform on the traveling vehicle body 1 so as to be swingable back and forth with respect to a neutral position, and a potentiometer 22 is provided to detect this swinging position. Also, potentiometers 23, 23 are provided for detecting the swash plate angles of the hydraulic pumps 20, 20, respectively, and the potentiometers 23, 23 of the hydraulic pumps 20, 20 correspond to the detected values of the potentiometer 22 of the steering lever 21. The control device 24 controls the drive circuit 2 so that the detection values of the drive circuits 23 and 23 are the same.
The control motors 26 and 26 are rotated in the forward and reverse directions via the control motors 5 and 25, so that the aircraft is continuously variable forward and backward. In other words, the left and right hydraulic pumps 20 are moved by the amount that the steering lever 21 is tilted.
- The swash plate angles of 20 are controlled so that they are displaced by the same amount.

A steering lever 4 for correcting the traveling direction of the traveling vehicle body 1 is provided on a control platform on the traveling vehicle body 1 so as to be rotatable left and right. When the sensor 16 detects the horizontal inclination of the traveling vehicle body 1, this detection result is input to the control device 24, and when the operation information 27 of the steering lever 4 is input, when the inclination is small, the hydraulic pump 20 on the turning side is activated. The swash plate of the control motor 26
The running bag r? is controlled to the neutral position by 12 is stopped, and when the slope becomes large, the swash plate of the hydraulic pump 20 on the opposite side of the slope is controlled to the reverse position by the control motor 26, and the traveling device 2 is moved in the opposite direction to the traveling device 2 on the opposite side of the slope. The turning state is controlled based on the left and right inclination of the traveling vehicle body 1 so that the vehicle body 1 is driven to the left and right.

When power is transmitted to each part and the steering lever 21 is tilted toward the forward side, one aircraft moves forward. Sensor 16 while driving
detects the left-right inclination of the traveling vehicle body 1, and when the inclination is small, for example in a hard field, when the steering lever 4 is rotated in the left-right direction, the traveling device 2 on the turning side stops and the traveling device 2 on the non-turning side stops. The direction of travel is corrected, resulting in a slow turn in which only the vehicle is driven. In a soft field, the re-sensor 16 which has a large inclination in the left and right direction of the traveling vehicle body 1 detects this inclination, and the reaping part 5
The pre-processing section 11 of is rotated around the axis 0, and the +W processing section 1
1, rolling control is performed to maintain the field horizontally. While driving on such a soft rllll field, the left and right inclination of the vehicle body 1 becomes large and the direction of travel tends to shift toward the inclination side, but when the sensor 16 detects this inclination and rotates the steering lever 4 left and right. , the traveling device 2 on the opposite slope side is driven in the opposite direction to the traveling device 2 on the slope side, resulting in a sharp turn, and the traveling direction is corrected.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a block diagram showing control, Fig. 2 is a hydraulic circuit diagram, and Fig. 3 is a side view of a combine harvester. In the figure, reference numeral 1 indicates a running vehicle body, 2 indicates a running device, 3 indicates a continuously variable transmission, and 4 indicates a steering lever.

Claims (1)

[Claims] The left and right traveling devices 2, 2 attached to the lower part of the traveling vehicle body 1 are respectively driven, and are provided with devices 3, 3 which are continuously variable in both forward rotation and reverse rotation, and control the traveling direction of the traveling vehicle body 1. When the left and right inclination of the vehicle body 1 is reduced by a predetermined rotational operation of the steering lever 4 to be corrected, only one of the left and right traveling devices 2 is driven for a gentle turn, and when the left and right inclination is large, the left and right travel device is activated. A steering device for a combine harvester or the like configured to be able to switch and control the steering state to make a sharp turn in which two wheels are driven in opposite directions.